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ANSWERS

DowntoearthdigsCertified GKH Gardening Expert

Answered on March 9, 2018

If you have the need to use a pre emergent herbicide to control weeds, I would choose one product and use according to the manufacturers application rates.
It also is wise to verify the weed type and use a herbicide specific to that weed or weeds.
Mixing two herbicides is not advised.

Choose the application process that best meets the needs of your lawn and it's surroundings.

You may also want to check with your County Extension Office to seek advice on the best product to use in your region.